public class Application{
   public static void main(String args[]) {
      Pillar pillar;
      Geometry bottom = null;
      pillar=new Pillar (bottom,100);
      System.out.println("体积"+pillar.getVolume());
      bottom=new Rectangle(12,22);
      pillar=new Pillar (bottom,58);
      System.out.println("体积"+pillar.getVolume());
      bottom=new Circle(10);
      pillar=new Pillar(bottom,58);
      System.out.println("体积"+pillar.getVolume());
   }
}
